Aspects of the present disclosure are directed to radar transmissions and related componentry. As may be implemented in accordance with various embodiments, radar signals are generated and transmitted using both scanning and fixed beam analog signal codes concurrently/as combined for each radar signal. Reflections of the radar signals from a target are processed for ascertaining positional characteristics of the target.

Distributed radar systems and techniques for processing data received from such distributed radar systems. The distributed radar systems may utilize data on beam spatial pattern for processing collected signals and determining direction of one or more reflection origins (e.g., one or more objects reflecting transmitted signal).

An earphone device includes a housing comprising a top region and a bottom region, an acoustic transducer disposed in the bottom region of the housing, and a radar system disposed in the top region of the housing. The radar system includes a first side and an opposite second side. The radar system is configured to detect a first object located on the first side of the radar system, and detect biometric data from a second object located on the second side of the radar system.

Automotive radar methods and systems for enhancing resistance to interference using a built-in self-test (BIST) module. In one illustrative embodiment, an automotive radar transceiver includes: a signal generator that generates a transmit signal; a modulator that derives a modulated signal from the transmit signal using at least one of phase and amplitude modulation; at least one receiver that mixes the transmit signal with a receive signal to produce a down-converted signal, the receive signal including the modulated signal during a built-in self-test (BIST) mode of operation; and at least one transmitter that drives a radar antenna with a selectable one of the transmit signal and the modulated signal.

There is provided a feeding network device for improved direction estimation. The feeding network device according to an embodiment of the disclosure includes a first coupler, a second coupler, a first delay, a second delay, a crossover, a third coupler, a fourth coupler, a third delay, and a fourth delay. Accordingly, one sum beam and a plurality of difference beams are emitted through the feeding network device of the array antenna, and improved direction estimation is possible through a plurality of monopulse ratios, and accordingly, improvement of direction estimation in a monopulse radar device is expected.

A radar system to detect and track objects in three dimensions. The radar system including antennae, transmit, receive and processing electronics is all in a small, lightweight, low-cost, highly integrated package. The radar system uses a wide azimuth, narrow elevation radar pattern to detect objects and a Wi-Fi radio to communicate to one or more receiving and display units. One application may include mounting the radar system in an existing radome on an aircraft to detect and avoid objects during ground operations. Objects may include other moving aircraft, ground vehicles, buildings or other structures that may be in the area. The system may transmit information to both pilot and ground crew.

An integrated slot waveguide antenna array for a radar system. The antenna array may include substrate integrated waveguide (SIW) elements, transmit, receive and processing electronics in a lightweight, low-cost, highly integrated package. The combination of antenna layout, specific dimensions of SIW features, including vias, terminal edges and slot placement may allow an efficient transmit and receive radar pattern as well as consistent, reliable and low cost manufacturing.

A distributed directional aperture (DDA) system provides the capability to receive and/or transmit signals, limiting that reception or transmission to a 3-dimensional beam. The DDA system includes sensing and/or emitting array subsystems which comprise sensors and/or emitters distributed across, within, or under the skin of an aircraft, ship, ground vehicle, or fixed installation. The sensors receive energy, convert the received signals to digital information, and transmit that information via a telemetry subsystem to a beamformer subsystem. The beamformer subsystem analyzes the received signals from the sensors and/or emitters in order to determine the signal content from a specific direction. The emitters transmit energy, converting signals received from the beamformer subsystem via the telemetry subsystem into energy emissions. Methods of providing the DDA system including subsystems thereof are also disclosed.

A dual or quad aperture radar array switches between states in between radiation cycles to acquire both sum and difference beams. The beams are then processed together to produce a central lobe enhanced beam and a side lobe enhanced beam via difference computations. During interleaved cycles, beams may be processed by Taylor weighting, split Taylor weighting, or Bayliss weighting. Multiple sets of switching cycles may be processed together to refine results.

A radar system to detect and track objects in three dimensions. The radar system including antennae, transmit, receive and processing electronics is all in a small, lightweight, low-cost, highly integrated package. The radar system uses a wide azimuth, narrow elevation radar pattern to detect objects and a Wi-Fi radio to communicate to one or more receiving and display units. One application may include mounting the radar system in an existing radome on an aircraft to detect and avoid objects during ground operations. Objects may include other moving aircraft, ground vehicles, buildings or other structures that may be in the area. The system may transmit information to both pilot and ground crew.